63456421 has 12 divisors (see below), whose sum is σ = 74500140. Its totient is φ = 53892216.

The previous prime is 63456413. The next prime is 63456431. The reversal of 63456421 is 12465436.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 26112100 + 37344321 = 5110^2 + 6111^2 .

It is not a de Polignac number, because 63456421 - 2³ = 63456413 is a prime.

It is a super-2 number, since 2×63456421² = 8053434732258482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63456401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 582115 + ... + 582223.

It is an arithmetic number, because the mean of its divisors is an integer number (6208345).

Almost surely, 2^63456421 is an apocalyptic number.

It is an amenable number.

63456421 is a deficient number, since it is larger than the sum of its proper divisors (11043719).

63456421 is an frugal number, since it uses more digits than its factorization.

63456421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 116 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 63456421 is about 7965.9538662987. The cubic root of 63456421 is about 398.8643223925.

The spelling of 63456421 in words is "sixty-three million, four hundred fifty-six thousand, four hundred twenty-one".